Pressed or molded ribbed glassware.



0. A. MYGATT. 'PRESSBD 0R MOLDED RIBBED GLASSWARE.

Patented oct. 29,1912.

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OTIS A. MYGATT, OF NEW YORK, Y.

ERESSED 0 3,A MQLDED RIBBED GLASSWARE.

Specioaton of Letters Patent.

recesses oet. es, asia.

y Application filed July 1, 1909. Serial No. 505,435.

To all whom it may concern:

Be it known that I, Oris A. MYGA'PI, a citizen of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Bressed or Molded Ribbed Glassware.

The object' of this invention is to improve radially ribbed pressed glass inclosures, for illuminating purposes such as reectors, shades and similar articles, and to produce such articles with a thinner edge and of a construction which enables better and more uniform results to be obtained than has been the oase with ribbed glassware as heretofore made.

- It is of Specialv advantage in glass. ro-

Vloctors with radial o1.` approximately radial double reecting prisms,V making a material increase in their reflective eiciency.

As heretofore` made,.the prisms of prismatic glass lreectors. and shades have been smallest in cross-section at the neck of the reflector where. the diameter o f the articlev is least and have gradually increased size, being largest at the mouth of the reiiectors Where itsA diameter is the greatest. This construction produces a relatively heavy artioiov with a thick edge` The roectors are removed from the mold at a tempera-ture at which theI portions of the prisms near the of any d eslred construction.

neck which arey formed 'in' the boter-fm or hottest par-t of the mold 'tend to run and lose y' glass article remains constant or does not their shape. When these parts of the prisms are small a very slight deformation will destroy the reflecting power of. the prism. Also as the molten glass mass is forced upf ward in the grooves and cavities of the mold under tho pleasure of, the plunger, it decreases in. volume and ooolr'to a suiioient extent to ow less. freely. The s acesfto be llod., however, are larger.. and t 'e result is that the larger'narts of the prisms are very apt to be imperfect,

Reieotors made according to this invention'are better balanced'upon their supporting than prismatic reflectors of the old type because of the better distribution of. the weight. i

In reflectors made according to my' invention'the parts of Ithe prismsw'hich leave thel mold at 'the vhighest temperature are Vlargestin 'cross-section so that slight deforma'tion will' not clostroy 4their reflecting.

properties. The grooves into which the owlng glass 1s forced decrease in size as the volume of the molten mass diminishes so that there is less strain on the apparatus andthe prisms are formed of greater perfection and sharpness of outline. Less glass is reqtuired, the article is lighter infweight'and i comes from the mold with a much thinner edge. rlhe thin edge is not Aonly desirable for the sake of appearance, but is also advantageous when itis desired after removal from the mold to crimp the edge, tlare it in or out or finish it to any required shape or size.

The same principle applied to light transfIOm the point of view of appearance andto i my desired. shape is .equal y great as in the `oase of refieotors.. f

from the increased facilit of finishing As the .ribbings taper fromy the neck to edge of a reflector or between the corresponding' parts of other glassware, there are left gradually widening intermediate spaces. These spaces may be provided with successive sets of similar ribbings. lf desired,

they may be depolished or provided with vertical ory radial or with transverse ribbings ln instances wherethe diameter of the appreciably increase, thev advantagesl of my construction .are not as great .as in. glassware of converging shape. There is still, however, a very marked saving in weight and thearticle thus produced may be made very attIeaCtvein appearance,`especially as ribbings of this typelmay be constructed and arranged in decorative forms.

Figure 1 is a partial elevation and pal'- tial section of a reflector as heretofore made. Fig. 2 is a partial elevation and ypartial section of a reflector constructed according to my invention. Fig. 3 is a top plan view of the relector shown in Fig 2. Fig. 4c is a Ipartial elevation and partial section of a emisphere constructed according to :my in'- vention. Fig. 5 is a top plan view of a re- Hector in which` the principles of a modication of, myl invention are 'ap lied. Fig.. 6 is an elevation of a modified shade-rezeotor.

Fig. 1 is a refiectoi` as heretofore made,

vicinity of point A', 'and it is vimpossible to tion.

avoid considerable loss of 'reflective qualities at this point on the reflector being taken from the mold.

The reflector, shown partly in elevation Aand partly in cross-section in Fig. 2, and in a top plan in Fig. 3, is constructed according to the principles of the present inven- For convenience in` both this figure and Fig. l asimple cone-shaped reflector is shown, although other shapes may be used as hereinafter illustrated. In this reflector' there are a plurality of sets of double-reflectingradia'l prisms which taper outwardly.

' AThe first set of prisms begin at 4the collar part C C ofthe reflector and taper uniformly to the wider mouth part D D5. The spaces between these prisms are provided with asecond set of similarly constructed prisms. A third set of prisms occupies the spaces between the second set of prisms, and so on. At the portion C C of the reflector which leaves the mold at the highest temperature the prisms are largest and their refiective powers least affected by slight deformation. The smallest portions of the prisms at D D are much sharper and more nearly perfect when formed in the upper partl of the mold than when formed in the lower narrowest part into which the molten glass is poured before the plunger-is inserted.- The prisms being smallest at D D where the diameter is greatest, less material is' required than for the form ofl construction shown in Fig. 1, resulting in the production of a thin edged lighter article.- Actual tests show that in additionv to the very substantial decrease in weight and gain in appearance given by my improved construe? t1on there is a decided gain in reflectingefciency over the old form of construction. In this modification the prisms have taken the form of diamonds. These serve to refiect the light back and forth within the shade and since the number of diamonds is increased ingthe lower portion of the shade, the light rays as they descend will be more and more broken up. Not only is a brilliant appearance imparted to the shade but the light is reflected backand forth within the shade by successively large numbers of da* monds or parts of diamonds.

Fig. 4 is a shade hemispherical in form villustrating one of the numerous decorative forms in which the principles of my inven-l `tion may be embodied. Successive sets of petal shapedprismsare formed near the Acollarportion which may be either reflecting or light transmitting, and .series of radial Y reflecting prisms of the type shown in Figs.

2 and 3, are formedupn the reflector in the neighborhood of the outer rim.

Fig. 6 is a side elevation of V`'a shade-re flector having' on its outer surface the radial reflecting'prisms extending integrally from the neck B yto the mouth and having the intermediate spaces provided with the hori zontal light transmitting' and light directing ribs.

While I have shown and described reflectors and shades having radial ribs my new construction may be extended (as already indicated) to articles of this sort in which the-ribbings are not radial. provided that a i thinning or narrowing of the ribbing in the direction of its length results in the formation of an article with a thin edge.

I' claim:

1. Ay glass body having a series of tapering ribs thereon., said ribs .being relatively 'larger and nearer one another at points nearest the axis ofA the glass body and .remote from the axis.

2. A hollow glass body of larger diameter at one end vthan at the other, said body havingl thereon ribs arranged approximately in the planes of the axis of the body, said ribs decreasing in dimensions from the smaller portion of the body toward the larger portion thereof. I f

3. A flaring hollowv glass body having thereon tapering'ribs arranged with their larger portions adjacent to the smaller end of the body.

4. A flaring hollow glass body having thereon a'plurality ofY tapering ribs, the ribs being arranged -with their larger ends toward the smaller portion of the body and Alio their smaller ends extending toward'the y' toward the larger portion of the body, and v other ribs arranged intermediate the ribs first mentioned, said other ribs having theirv larger portions toward the smaller part of' the body and extending toward the other "Y portion of the body.

6. hollow Haring glass body provided with a series of reflecting prisms extending approximately from one end of' the body to the other, said prisms decreasing in dimenva collar portion and an open y the larger portions of the said ribs being adjacent to the collar and the smaller portions being adjacent to the mouth.

8. A glass reflector, or the like, compris ing acollar portion and` a flaring side portion extending therefrom, the side portion being provided with tapering ribs, the

- larger portions of the ribs being arranged adjacent to the collar.

9. A glass ing a collar portion and lthe flaring side .portion extending therefrom, the side portionl being provided with tapering reflect-- ing prisms arranged with their larger portions adjacent to the collar.

10. A glass reflector or similar article, comprising a collar portion and an open mouthed flaring side portion, the vside por-1 tion being provided with a plurality of sets of prisms arranged approximately in the planes of the axis of the reflector, said prisms tapering insize from one end to the vother and lbeing arranged with its larger portion toward the collar.

11. A glass body having a series of tapering reflecting prisms thereon, said prisms being relatively'larger vand nearer o ne another at points-nearest the axis of the glass reflector or the like, compris? each of bodyand smallerv and farther apart at points more remote from the axis.

12. A pressed glass shade having a smooth interior, the exterior portion of the shade having projecting diamonds, the shade in creasing in diameter toward the bottom and the bottom rows containing a larger number of smaller diamonds than the upper row or rows. L

13. A crystal glass shade which enlarges in diameter downwardly, said shade having external projecting diamonds arranged in circular rows, the diamonds in the lower rows being smaller than those in the upper rows and of much greater number.

14. A crystal glass shade having a larger diameter at its lower end than at its upper end and provided with integral external diamond-shaped projections, there being a larger number of smaller diamonds 'around the lower part of the shade than around .the upper part.

15; A glass shade having vexternal diamonds arranged in circular rowsl` thelower half of the `full diamonds in one of the upper rowsoverlapping the diamonds in two of the lower rows.

16.V A ,glass shade having external diamonds arranged in circular rows, the lower half of .the full diamonds in one of the lower rows being equal to the length of the diamonds in the row below it.

17. A glass shade having external diamonds arranged in circular rows, the lower rows `containing more diamonds than the upper rows, the4 lower portions of the diamonds in one row being longer than the upper portions of said diamonds.

so,l

In testimony whereof, I have signed my.;V

name in the presence of two witnesses.

OT-IS A. MYGATT. Witnesses:

J oEL B. LIBERMAN, ERNEST P. RAY.

Copies of this patent may be obtained 'for ive cents each, by addressing ,the Commissioner of Patents, 'Washingtom D. C. p 

